Introduction to Environmental Chemistry 15+hours of lectures

Explore how the environment, defined as a system in contact with surroundings, shapes the atmosphere, oceans, and human society, guiding sustainable development and pollution awareness through environmental chemistry.

Trace the origin of the universe from the big bang to stellar nucleosynthesis, highlighting carbon, nitrogen, oxygen, silicon, and the formation of Earth's crust, atmosphere, and oceans.

Trace the origin of Earth's atmosphere from volcanic gas release to oxygen buildup, explore early life emergence, ozone formation, and the Gaia theory's view of biogeochemical cycles.

Explore how human activities introduce exotic chemicals like pesticides DDT and CFCs, and how they alter carbon and sulfur cycles with climate and ozone impacts.

Explore the chemical elements and the periodic table, focusing on ionization energy and valence electrons. Understand bonding, isotopes, metals, nonmetals, and semiconductors to connect basic chemistry to environmental issues.

Explore covalent bonding through electron sharing and ionic bonding via electrostatic interactions and electron transfer, illustrated by sodium chloride; understand ions, cations, anions, and the silicon exception.

Learn chemical equations in environmental chemistry by balancing atoms, reading reaction directions, and interpreting states (l, g, s, aq) through rusting iron and salt dissolution, highlighting equilibrium-based chemistry.

This episode explains the mole and Avogadro's number, and the amount of substance. It defines concentration, activity, and activity coefficients, and discusses molarity and atmospheric chemistry contexts.

Outline the structure and chemistry of organic molecules, highlighting carbon-hydrogen backbones, covalent bonds, hydrocarbons and aromatic rings, functional groups, and carbohydrate examples such as glucose and sucrose.

Explore the radioactivity of elements, focusing on radioactive decay, isotopes, and the transformation of nuclei via alpha, beta, and gamma processes, including natural and anthropogenic fallout.

Explore the atmosphere’s layers—from troposphere through thermosphere—and how solar input drives atmospheric circulation, temperature structure, and the hydrological cycle via radiation balance.

Explore how the sun's shortwave radiation drives Earth's energy balance and how atmospheric absorption shapes the planetary albedo, longwave radiation, and the equilibrium surface temperature.

Explain how radiation is absorbed by atmospheric trace gases, from solar shortwave to outgoing longwave infrared, highlighting stratospheric ozone and the atmospheric window.

Explore how the stratospheric ozone layer shapes the temperature profile by absorbing UV radiation, driving ozone formation and destruction, and trapping long-wave radiation to warm the upper atmosphere.

Explore how convection transfers heat in the atmosphere, using latent heat, cloud formation, and lapse rate to shape the energy budget and temperature profiles.

Trace the Earth's atmospheric energy budget from incoming shortwave solar energy to outgoing longwave radiation, detailing convection, latent heat, albedo, and equator-to-pole energy transfers.

Explore how the atmosphere and oceans transfer heat from the equator toward the poles through Hadley circulation, Ferrel cell, and return flows that maintain hemispheric energy balance.

Explore how solar radiation drives the biosphere, controlling photosynthesis, light response, and energy balance, while analyzing how ozone depletion and anthropogenic emissions alter UV exposure and biospheric processes.

Explore the global carbon cycle and carbon dioxide's climate role. See how fossil fuel use and deforestation drive atmospheric carbon and ocean sinks.

Explore the methane and carbon monoxide cycles, highlighting anthropogenic and natural methane sources, the role of the hydroxyl radical, and the atmospheric lifetimes shaping climate and air quality.

Explore the global nitrogen cycle, including ammonia and nitrous oxide roles, atmospheric chemistry shaping ozone and aerosol formation, and ocean and soil sources driving the earth's nitrogen budget.

Explore the global sulfur cycle, including sulfur dioxide emissions from fossil fuels, natural sources, and tropospheric oxidation to sulfuric acid and aerosol effects.

Explore the global sulfur cycle's major sulfur species—carbon sulfide, hydrogen sulfide, and dimethyl sulfide—examining their lifetimes, sinks, natural and anthropogenic sources, and potential climate impacts through cloud condensation nuclei.

Explores the global halogen cycle, detailing natural halogens in the atmosphere and the roles of CFCs, HCFCs, and HFCs, plus the Montreal Protocol's phase-out and replacement considerations.

Explore the global halogen cycle, focusing on methyl chloroform, carbon tetrachloride, halons, and methane; cover anthropogenic and natural sources, atmospheric lifetimes, ocean uptake, and Montreal Protocol implications.

Analyze the global halogen cycle, detailing methyl chloride as the atmosphere's dominant organohalogen and methyl bromide's ozone depletion linked to oceanic flux, pesticide use, and the Montreal Protocol phase-out.

Investigate the global halogen cycle IV, detailing methyl iodide as a marine-origin tropospheric iodine source with a two to ten day residence time, and sea salt driven photochemistry.

Explore primary pollutants carbon dioxide and volatile organic compounds, their anthropogenic and natural sources, and CO2's major role in the enhanced greenhouse effect with rising pre-industrial to present levels.

Explore primary pollutants with a focus on methane (CH4), its simple structure, atmospheric impact, and rising global emissions from wetlands, rice paddies, ruminants, and fossil fuel sources.

Explore primary pollutants, focusing on non methane volatile organic compounds (nmvocs), their anthropogenic and natural sources, photochemical ozone formation, and regional emission trends.

Explore the sources and sinks of carbon monoxide, including anthropogenic vehicle emissions and methane oxidation, and understand its health risks and seasonal cycles.

drives health hazards and environmental damage through sulfur dioxide, a primary pollutant formed by burning sulfur-containing fuels, fueling acid rain via sulfuric acid and sulfate aerosols from coal-fired power plants.

Explore long-lived halocarbons and their sources, their role in atmospheric chemistry and ozone depletion, and how regulation (Montreal Protocol) and replacements mitigate their climate and ozone impacts.

Explore how tropospheric ozone forms from volatile organic compounds and nitrogen oxides under bright sunlight, driving photochemical smog. Assess health, materials, and vegetation impacts and the transboundary nature of ozone.

peroxyacetyl nitrate, pan, is a secondary pollutant formed in the troposphere and acts as a reservoir for nitrogen oxides, with a temperature-dependent lifetime and long-range transport.

Identify hazardous air pollutants, including benzene, 1,3-butadiene, PAHs, dioxins, and PCBs, their carcinogenic health effects, and major emission sources such as road transport and combustion processes.

Investigate the sources of global particulate material, including natural and anthropogenic aerosols, and distinguish primary from secondary particles such as sulfate, nitrate, organic compounds, and black carbon.

Understand primary PM10 and its PM2.5 fraction, including primary and secondary aerosol formation, key sources like diesel transport, coal burning, and atmospheric reactions, and related emission trends.

Explore secondary PM10 aerosols formed from sulfate production via oxidation of sulfur dioxide, including sulfuric acid and ammonium sulfate, and their impacts on visibility and environmental acidification.

Discover tropospheric chemistry, including oxidation chemistry, photochemical initiation by ozone, and the fate of trace gases that drive acid deposition, ozone episodes, and climate implications.

Investigate how bright light initiates tropospheric photochemistry by dissociating ozone and formaldehyde, generating reactive atoms and radicals, with the sun as the main light source and spectral irradiance shaping reactions.

Explore tropospheric oxidation chemistry and oxidizing capacity, driven by hydroxyl radicals from ozone and water vapor, and involving hydrogen peroxide, methane, and nitrogen oxides.

Explore the role of nitrogen oxides in the troposphere, their fossil and natural sources, the interconversion between nitrogen monoxide and nitrogen dioxide, and the photostationary state relevant to ozone formation.

Explore photochemical production and destruction of tropospheric ozone, detailing how NOx and VOCs, OH radicals, and radical cycles control ozone formation, loss, and the composition point.

Investigate the production and destruction of tropospheric ozone, including the compensation point and the nonlinear balance between NOx and VOCs.

Explore the role of hydrocarbons in environmental chemistry, detailing how methane and non-methane hydrocarbons drive tropospheric oxidation, produce carbon monoxide and ozone, and shape troposphere chemistry through hydroxyl-initiated reactions.

Explore how urban atmospheres form photochemical smog and tropospheric ozone from non methane hydrocarbons and nitrogen oxides under sunlight, highlighting hydroxyl radicals and nitrous acid chemistry.

Explore the spring ozone maximum in the troposphere and its photochemical and transport processes. Examine how stratosphere troposphere exchange, regional cycles, and hemispheric differences shape seasonal ozone trends.

Explore nighttime oxidation chemistry in the troposphere, focusing on the nitrate radical (NO3) formed from NO2 and ozone, its role in forming nitric acid and oxidizing nocturnal hydrocarbons.

Explore ozone–alkene chemistry in the atmosphere, including ozone–alkene reactions, hydroxyl radical formation, and how product yields and alkene structure affect atmospheric lifetimes.

Explore how nitrogen dioxide reacts with conjugated dienes in polluted tropospheric conditions, forming hydroxyl radical and driving oxidation cycles relevant to vehicle emissions and night-time chemistry.

Explore sulfur chemistry as a vital part of the atmosphere, tracing natural and anthropogenic sulfur sources, the oxidation of sulfur dioxide to sulfuric acid, and tropospheric aerosol formation.

Explore tropospheric halogen chemistry, detailing how natural and anthropogenic trace species degrade into halogen compounds from sea salt and pollution that drive ozone-related oxidation.

Explore ozone formation from ultraviolet light, its protective role in the stratosphere, and how CFCs and nitrous oxide deplete it through atmospheric transport.

Explore the stratosphere's structure from 10 to 50 km and how ozone-driven warming, UV reactions, and pollutant transport like CFCs shape its chemistry.

Explore the stratosphere's structure and sharp gradient patterns in trace gases and aerosols. Examine mixing barriers, including the polar vortex and subtropical/tropical pipes, and the role of Rossby-wave filaments.

Explore the structure of the stratosphere and the mass exchange with the troposphere, including how CFC transport and tropopause folds shape ozone distribution and atmospheric oxidation.

Explore gas-phase chemistry of the stratosphere, focusing on ozone production and loss via the Chapman cycle, the oxygen atom and molecule system, and the concept of oxygen families.

Explore gas-phase stratospheric chemistry, detailing ozone-depleting catalytic cycles and radical families such as hydroxyl, nitrogen oxides, and halogens, and explain how nighttime reactions and transport timescales influence ozone loss.

Examine ozone depletion cycles in the stratosphere that do not rely on oxygen atoms. Explore sunlight-driven cycles, chlorine reservoir destruction, polar vortex dynamics, and future topics on aerosols and clouds.

Explore how stratospheric aerosols and polar stratospheric clouds drive ozone depletion through sulfuric acid droplets, nitric acid, and heterogeneous chemistry under temperature variations.

Explore heterogeneous chemistry of the stratosphere, including PSC particles, chlorine activation, nitric acid trihydrate, and temperature-dependent uptake that link solid particle surfaces to ozone depletion.

Trace future perturbations to the stratosphere, including Montreal Protocol driven declines in ozone-depleting gases, late chlorine and bromine peaks, and potential impacts from supersonic and subsonic aircraft.

Explore atmospheric aerosols, their natural and anthropogenic sources, primary and secondary origins, and gas-to-particle conversion, including size modes, mixtures, lifetimes, and climate direct and indirect effects.

Explore the size distribution of atmospheric aerosols, including number size distribution, volume concentration, and how composition and geographic origin shape source categories.

Explore natural aerosol sources, including sea salt and desert dust, and distinguish primary from secondary and natural versus anthropogenic emissions. Examine how wind and size distribution affect their atmospheric lifetime.

Explore natural sources of aerosols, focusing on sulfur-containing gas precursors and marine emissions. Explain how oceanic dimethyl sulfide and phytoplankton activity form sulfate aerosols via oxidation.

Examine anthropogenic aerosol sources, especially biomass burning as a major primary emission, and summarize soot and organic and inorganic carbon fractions alongside industrial aerosols from coal, mining, and cement processes.

Investigate how fossil fuel–driven emissions oxidize sulfur dioxide to sulfuric and nitric acids, forming ammonium sulfate and ammonium nitrate aerosols and driving secondary organic aerosol formation.

Explore heterogeneous chemistry, where gas-particle interactions on solid or liquid surfaces drive adsorption, absorption, and surface reactions in atmospheric aerosols.

Explain how dry aerosols interact with gaseous species in environmental chemistry, including sea salt aerosol reactions with nitric acid and surface nitrate formation, plus nitrogen dioxide reduction on particle surfaces.

Explore how liquid aerosols take up gas molecules via diffusion and uptake coefficients, driving heterogeneous reactions with hydrogen peroxide and ozone to form sulfuric and nitric acids.

Explore how climate forcing from natural and anthropogenic aerosols and greenhouse gases shapes radiative energy, cloud properties, and regional versus global warming, including uncertainties.

Explore how aerosol diameter and radiation wavelength govern scattering, absorption, and extinction, and how single scattering albedo and Angstrom exponent describe their optical properties.

Examine how direct aerosol forcing from sulfate, biomass burning, and other aerosols shapes climate, with model-based estimates and uncertainties, including volcanic aerosols and regional versus non-local effects.

Explore how aerosols act as cloud condensation nuclei to alter cloud properties, albedo, and precipitation, examining natural and anthropogenic sources and marine versus continental effects.

Explore the uncertainties in aerosol–cloud interactions and their impact on radiative forcing estimates, with recent evidence that biomass-burning aerosols alter cloud albedo and droplet size in Amazonia.

Explore how satellite remote sensing measures global distributions of atmospheric gases and aerosols, revealing tropospheric and stratospheric composition, calibration standards, and implications for detecting anthropogenic climate change.

Explore the chemistry of continental solids, including rocks, sediments, and soils, through weathering, transport by rivers, and biogeochemical interactions that shape ecosystems and climate.

Explore how Earth's crust hosts silicate minerals built from silicon tetrahedra bonded to oxygen, and understand the radius ratio rule, polymerization, and progression from isolated tetrahedra to silicates like quartz.

Examine how physical, chemical, and biological weathering sculpt rocks at the earth's surface, increasing surface area and driving mineral dissolution through water, oxygen, acids, and microbial activity.

Examine how water dissolves silicate minerals, releasing ions and forming electrolyte solutions. Explore oxidation of iron-bearing minerals and organic matter that produce acids and hydrated iron oxides.

Explain the mechanisms of chemical weathering in environmental chemistry, including carbonate and silicate weathering, carbonic acid action, and the role of carbon dioxide in forming calcium carbonate and bicarbonate.

Clay minerals form layered tetrahedral and octahedral sheets, creating one-to-one and two-to-one structures with a net negative charge that drives cation exchange.

Explore how soils form through weathering of parent material influenced by climate, time, and biology, detailing mineral suites, sand-silt-clay balance, and the critical role of water balance.

Examine soil formation processes influenced by relief and vegetation, explore soil organic matter and humus roles, and discuss microbial weathering and nutrient cycling shaping soils.

Examine how weathering, erosion, and leaching shape soil and clay mineral formation, producing illite, smectite, and kaolinite. Compare tropical and high-altitude settings through ion exchange and CIA weathering indicators.

examine how soil horizons form and are classified using USDA and FAO systems, and how leaching, clay dynamics, and reduction and oxidation conditions shape soil structure.

Explore organic contaminants in soil of contaminated land, their sources, behavior, absorption and entrapment, aging, degradation by microbes, and how soil properties influence mobility and cleanup.

Explore physical, chemical, and biological remediation for contaminated land, assessing cost, sustainability, and soil factors while highlighting microbial oil degradation and the Exxon Valdez example.

Explore composting and bioremediation of contaminated land, detailing bio piles, aerobic microbial degradation of chlorinated compounds and polycyclic aromatic hydrocarbons, and remediation using plants and trees.